(a) A monitoring program shall be required for all Class I wells that will be adequate to establish baseline data and ensure knowledge of migration and behavior of the discharge. - (i) Monitoring may be required for any circumstance where groundwaters of the State could be affected.
- (ii) The extent and design of a monitoring system shall be sufficient to deal with the pollution potential of the proposed discharge.
(b) The monitoring program shall consist of any or all of the following: - (i) Pre-discharge or pre-operational monitoring;
- (ii) Operational monitoring;
- (iii) Post-discharge or post-operational monitoring;
- (iv) Recordkeeping and reporting;
- (v) Such additional requirements established by the administrator to meet the purposes of the Wyoming Environmental Quality Act and these regulations.
(c) Each monitoring program shall include maps and cross-sections, where appropriate, showing the location, lithology, and screening interval of each monitoring site.
(d) The operator is responsible for properly installing, operating, maintaining and removing all necessary monitoring equipment.
(e) At a minimum, the permittee shall monitor the pressure in the injection zone annually, including at a minimum, a shut down of the well for a time sufficient to conduct a valid observation of the pressure falloff curve.
(f) When prescribing a monitoring system, the administrator may also require: - (i) Continuous monitoring for pressure changes in the first aquifer overlying the confining zone. When such a well is installed, the operator shall, on a quarterly basis, sample the aquifer and analyze for constituents specified by the administrator;
- (ii) The use of indirect, geophysical techniques to determine the position of the waste front, the water quality in a formation designated by the administrator, or to provide other site specific data;
- (iii) Periodic monitoring of the groundwater quality in the first aquifer overlying the receiver;
- (iv) Periodic monitoring of the groundwater quality in the lowermost underground source of drinking water; and
- (v) Any additional monitoring necessary to determine whether fluids are moving into or between any aquifers penetrated by the well.
- (vi) The administrator may require seismicity monitoring when he has reason to believe that the injection activity may have the capacity to cause seismic disturbances.
(g) The operator shall develop and follow an approved written waste analysis plan that describes the procedures to be carried out to obtain detailed chemical and physical analyses of a representative sample of the waste, including quality assurance procedures used. At a minimum, the plan shall specify: - (i) The parameters for which the waste will be analyzed, the rationale for the selection of these parameters, and the test methods to be used to test for these parameters; and
- (ii) The sampling method that will be used to obtain a representative sample of the waste.
(h) The operator shall repeat the analysis of the injected wastes in the manner and on the schedule described in the waste analysis plan, and when process or operating changes occur that may significantly alter the characteristics process, or operating changes occur that may significantly alter the characteristics of the waste stream.
(i) The operator shall conduct continuous or periodic monitoring of selected parameters as required by the administrator.
(j) The operator shall assure that the plan remains accurate and the analyses remain representative.
(k) Testing and monitoring requirements for all Class I hazardous waste wells shall include: - (i) Submission of information by the applicant demonstrating that the waste stream and its anticipated reaction products will not alter the permeability, thickness, or other relevant characteristics of the confining or discharge zones such that they would no longer meet the requirements specified when the area of review was calculated.
- (ii) Submission of information by the applicant demonstrating that the waste will be compatible with the well materials with which the waste is expected to come into contact and a description of the methodology used to make that determination. Compatibility for purposes of this requirement is established if contact with injected fluids will not cause the well materials to fail to satisfy any design requirement imposed under Section 11 of this chapter.
- (iii) The administrator shall require continuous corrosion monitoring of the construction materials in the well for all wells where the pH of the injection fluid is less than two (2) or greater than eleven ( 11), and may require such monitoring of other wastes. This monitoring may be conducted by placing samples of the well construction materials in contact with the waste stream or routing the waste stream through a loop constructed of the same materials used in the well, or by using an alternative method approved by the administrator.
- (iv) If a corrosion monitoring program is required, the test shall use identical materials to those used in the construction of the well, and such materials shall be continuously exposed to the operating pressures, temperatures, and flow rates of the injection operation as measured at the well head. The operator shall monitor the materials for loss of mass, thickness, pitting, and other signs of corrosion on a quarterly basis to ensure that the well components meet the minimum standards for material strength and performance set forth in Section 11 of this chapter.
(l) In addition to the above-mentioned requirements, operators of Class I hazardous waste wells shall also conduct mechanical integrity testing as follows: - (i) The long string casing, injection tubing, and annular seals shall be tested by means of an approved pressure test with liquid or gas on an annual basis and whenever there has been a well workover;
- (ii) The bottom-hole cement shall be tested by means of an approved radioactive tracer survey annually;
- (iii) An approved temperature, noise, or other approved log shall be run at least once every five (5) years to test for movement of fluid along the borehole. The administrator may require such tests whenever the well is worked over;
- (iv) Casing inspection logs shall be run at least once every five (5) years, unless the administrator waives this requirement due to well construction or other factor's which limit the test's reliability; and
- (v) Any other test approved by the administrator may also be used. Procedures for approval of unauthorized mechanical integrity tests are outlined in Section 9(d)(7) of this chapter.
- (vi) The administrator shall be given the opportunity to witness all logging and drill stem testing done by the operator at any time during the permitting of any well under this chapter. The operator shall submit a schedule of such planned logging and testing to the administrator at least thirty (30) days prior to the first test.
020-13 Wyo. Code R. § 13-13